Also known as o-hydroxybenzoic acid,C6H4(OH)(COOH) is a white powder with an acrid taste that is stable in air but gradually discolored by light. Soluble in acetone, oil of turpentine, alcohol, ether,benzene; slightly soluble in water,and combustible. Derived by reacting a hot solution of sodium phenolate with carbon dioxide and acidifying the sodium salt thus formed. Used in the manufacture of aspirin and salicylates, resins, dyestuff intermediate, prevulcanization inhibitor, analytical reagent,and fungicide.

It's colorless and odorless and has a very slight charactoristic taste. These properties make propylene glycol particularly suitable as a solvent for flavoring and dyes in cosmetics, toothpastes , shampoos , and mouthwashes .

Propylparaben is a colorless and fine crystalline or white crystalline powder, almost odorless and with slightly astringent.Soluble in ethanol, ethyl ether, acetone and other organic solvents, slightly soluble in water.